标题： 极性群体在有序无序界面的电流反转 显示英文标题

标题： Current reversal in polar flock at order-disorder interface

摘要： 我们研究了一个在薄矩形通道中设计成有序-无序-有序三个区域的极性自推进粒子（SPPs）系统。 三个区域的划分是基于SPPs在各自区域中经历的噪声。 两个宽区域中的噪声被选择为低于有序-无序相变的临界噪声，而中间区域或界面中的噪声高于临界噪声。 这使得系统的几何结构类似于固态物理中的约瑟夫森结（JJ）。 保持所有其他参数不变，我们研究了不同接合宽度下体内的SPPs以及沿界面的性质。 随着界面宽度的增加，系统表现出从整个系统中相干运动的SPPs到大界面宽度时的中断电流的有序-无序相变。 令人惊讶的是，在界面内部，我们观察到了中间宽度界面的电流反转。 这种电流反转是由于界面内存在的强随机性，使界面壁成为反射性的。 因此，我们的研究给出了SPPs在界面处的新颖有趣的集体特性，这可能有助于设计使用活性粒子的开关等器件。 显示英文摘要

摘要： We studied a system of polar self-propelled particles (SPPs) on a thin rectangular channel designed into three regions of order-disorder-order. The division of the three regions is made on the basis of the noise SPPs experience in the respective regions. The noise in the two wide region is chosen lower than the critical noise of order-disorder transition and noise in the middle region or interface is higher than the critical noise. This make the geometry of the system analogous to the Josephson Junction (JJ) in solid state physics. Keeping all other parameters fixed, we study the properties of the moving SPPs in the bulk as well as along the interface for different widths of the junction. On increasing interface width, system shows a order-to-disorder transition from coherent moving SPPs in the whole system to the interrupted current for large interface width. Surprisingly, inside the interface we observed the current reversal for intermediate widths of the interface. Such current reversal is due to the strong randomness present inside the interface, that makes the wall of the interface reflecting. Hence Our study give a new interesting collective properties of SPPs at the interface which can be useful to design devices like switch using active agents.